This seems unsolvable without new compostable or otherwise easily processed plastics. At our university a bioplastic "nonoilen" was developed that can be made

This seems unsolvable without new compostable or otherwise easily processed plastics. At our university a bioplastic "nonoilen" was developed that can be made from waste biomass (PLA + polyhdroxybutyrate formula) and compostable without any toxic residues. So far, like most "compostable" plastic, it requires industrial composter with temperatures over 50°C, but further improvements are being developed. https://www.plasticsinsight.com/stu-team-develops-second-generation-bio-plastics-from-waste-frying-oil/ https://www.plasticsinsight.com/stu-team-develops-second-gen... Toothbrush manufacture is planned (Slovak language, sorry). Hope it works out: https://aprilmagazin.curaprox.com/prve-curaprox-kefky-z-bioplastu-su-na-svete-v-plane-su-aj-rozlozitelne-vlakna/ https://aprilmagazin.curaprox.com/prve-curaprox-kefky-z-biop...